Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 14:50

General

  • Target

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe

  • Size

    203KB

  • MD5

    6b7204c0cb219b7d01999025ccd85fdc

  • SHA1

    1f57fbfdcf6d71d0d5a36602e1e83bc9dee3ac7a

  • SHA256

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40

  • SHA512

    68a19f84eb4d73394a2bb2b7629f9582e91b54713b19e71722ba5359636ce36d9aa9951af7b729d65752a7aff916ee91abd87f34c2e4aad43cebef777800742b

  • SSDEEP

    3072:eSf/dfuraZJXENc8uCXJiXK1K2LS1G2B+vioyUSdUuD5BBNcRrxOJ+cmH:eSf/MQ15t1TB+PSHexLco

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe
    "C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1336
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\czlrqtby\
      2⤵
        PID:2088
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rlqojmjl.exe" C:\Windows\SysWOW64\czlrqtby\
        2⤵
          PID:2448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create czlrqtby binPath= "C:\Windows\SysWOW64\czlrqtby\rlqojmjl.exe /d\"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2496
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description czlrqtby "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start czlrqtby
          2⤵
          • Launches sc.exe
          PID:2644
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:2560
      • C:\Windows\SysWOW64\czlrqtby\rlqojmjl.exe
        C:\Windows\SysWOW64\czlrqtby\rlqojmjl.exe /d"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2668
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2468

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\rlqojmjl.exe
        Filesize

        11.4MB

        MD5

        8ea82697e8bee1d87b6d25e9db1d264a

        SHA1

        97c12ac94d6480fb10dae685a55f6933190dd21f

        SHA256

        c732dde522f859738a61ab13741007ed0ac77636499db6d9f3f0d9c4d1a69510

        SHA512

        e8c915b91fc33a8d26b41efbbbc52e66f3f449789edcd6b5cb3360b7726bce69c196c748185c7d8d71fc60f7334f07436c5cf2c067335509199650f676198e34

      • memory/1336-1-0x0000000000230000-0x0000000000330000-memory.dmp
        Filesize

        1024KB

      • memory/1336-2-0x00000000003A0000-0x00000000003B3000-memory.dmp
        Filesize

        76KB

      • memory/1336-3-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/1336-6-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/1336-7-0x00000000003A0000-0x00000000003B3000-memory.dmp
        Filesize

        76KB

      • memory/2468-44-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-37-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2468-12-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2468-61-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2468-15-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2468-19-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2468-20-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2468-22-0x0000000001870000-0x0000000001A7F000-memory.dmp
        Filesize

        2.1MB

      • memory/2468-25-0x0000000001870000-0x0000000001A7F000-memory.dmp
        Filesize

        2.1MB

      • memory/2468-26-0x0000000000100000-0x0000000000106000-memory.dmp
        Filesize

        24KB

      • memory/2468-29-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-32-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-33-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-34-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-35-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-36-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-57-0x0000000000210000-0x0000000000217000-memory.dmp
        Filesize

        28KB

      • memory/2468-38-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-39-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-40-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-41-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-42-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-43-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-56-0x0000000005440000-0x000000000584B000-memory.dmp
        Filesize

        4.0MB

      • memory/2468-45-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-46-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-47-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-48-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2468-49-0x00000000001A0000-0x00000000001A5000-memory.dmp
        Filesize

        20KB

      • memory/2468-52-0x00000000001A0000-0x00000000001A5000-memory.dmp
        Filesize

        20KB

      • memory/2468-53-0x0000000005440000-0x000000000584B000-memory.dmp
        Filesize

        4.0MB

      • memory/2668-10-0x0000000000560000-0x0000000000660000-memory.dmp
        Filesize

        1024KB

      • memory/2668-11-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/2668-17-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB